I've noticed a few of the people on the list have had this problem.I've had this problem twice over the years.Once on my 55 Chevy{1st car as a kid} and the 2nd time on my 426 MW.Both times I used Permatex Av-gasket sealer to fix it.The 55 was on the front motor mount and the 426 MW was on the exhaust manifold.Both times sealed great and never had another problem with either.I know it's that sticky brown crap BUT guys,it worked.I coated the bolt and just screwed it in tight.Never again had the problem.Hope this will help some of you with the leaky bolt problem.
Jim